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Ubuntu Security Notice USN-3516-1
January 05, 2018

firefox vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Firefox could be made to expose sensitive information.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

It was discovered that speculative execution performed by modern CPUs
could leak information through a timing side-channel attack, and that
this could be exploited in web browser JavaScript engines. If a user were
tricked in to opening a specially crafted website, an attacker could
potentially exploit this to obtain sensitive information from other
domains, bypassing same-origin restrictions. (CVE-2017-5715,
CVE-2017-5753, CVE-2017-5754).

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.10:
  firefox                         57.0.4+build1-0ubuntu0.17.10.1

Ubuntu 17.04:
  firefox                         57.0.4+build1-0ubuntu0.17.04.1

Ubuntu 16.04 LTS:
  firefox                         57.0.4+build1-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  firefox                         57.0.4+build1-0ubuntu0.14.04.1

After a standard system update you need to restart Firefox to make
all the necessary changes.

References:
  https://www.ubuntu.com/usn/usn-3516-1
  CVE-2017-5715, CVE-2017-5753, CVE-2017-5754

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/57.0.4+build1-0ubuntu0.17.10.1
  https://launchpad.net/ubuntu/+source/firefox/57.0.4+build1-0ubuntu0.17.04.1
  https://launchpad.net/ubuntu/+source/firefox/57.0.4+build1-0ubuntu0.16.04.1
  https://launchpad.net/ubuntu/+source/firefox/57.0.4+build1-0ubuntu0.14.04.1